In the case of a district which contains only unincorporated territory in more than one county, the district board may be elected or may be appointed by the boards of supervisors of the counties in which the district is located. If the district board is appointed by the boards of supervisors, they shall appoint directors according to the proportionate share of population of that portion of each county within the district, provided that each board of supervisors shall appoint at least one director.

In the case of a district which contains unincorporated territory and the territory of one or more cities, the district board may be elected or appointed by the county board of supervisors and the city councils in which the district is located. If the district board is to be appointed, the board of supervisors and the city council or councils shall appoint directors according to the proportionate share of population of that portion of the county and each city within the district, provided that the board of supervisors and each city council shall appoint at least one director.

In the case of a district which includes only incorporated territory in more than one city, the district board may be elected or appointed by the city councils in which the district is located. If the district board is appointed, the city councils shall appoint directors according to the proportionate share of population of that portion of each city within the district. However, each city council shall appoint at least one director.